Even if you didn't play any Strategy RPGs, I think Mario + Rabbids is a great game because it pares down the genre to the basics, in which everything is simple: the movement, the positioning and the attacking. Because of this, it's easy to keep track of everything and the luck aspect is also simple (either you have a direct hit, no hit, or 50/50). The game is also decently challenging, but if you are looking for a real challenge, there are always the post-world challenges to keep on your toes.
And then, there are the characters: every character has something they can only do, so it's not a waste to pick anyone, although be warned: Mario is mandatory in the quest while at least one Rabbid is required. With that said, since Mario is one of the better characters, he's going to be a reliable pick throughout the game.
From this point onward, the Gold edition will have good discounts so if there is one, go for it, since it has the Donkey Kong pack, and I heard great things about it (unfortunately for me, I didn't get the Gold edition so I can't enjoy the DK pack since there aren't any discounts for DLC that I heard of).
Thank you for reading.